...fundamental laws of simple refraction are two. $ 1. The planes of incidence and refraction coincide. § 2. The ratio of the sines of the angles of incidence and refraction is constant for the same media. Let NP'N' [Fig. 29] represent a vertical section of a hemispherical...

...QO : qO : : sin R'OF : sin QOP, QO:fO:!jK:i, QS : qS : : fi : 1, and (7) The refractive index ju is the ratio of the sines of the angles of incidence and refraction, when the former is greater than the latter, which is always found to be the case when the light passes...

...the second law of refraction, that is to say, the planes of incidence and refraction coincide, but the ratio of the sines of the angles of incidence and refraction is not constant. 4. The velocity of light in a crystal not being the same for the ordinary ray as the...

...each transparent medium has its own particular refracting power, but for the same transparent medium the ratio of the sines of the angles of incidence and refraction is always the same. 94. Index of refraction. — The number which thus expresses the ratio of the sine...

...difference of less than half a degree each way. When we consider how simple the law of refraction is, (that the ratio of the sines of the angles of incidence and refraction is constant for the same medium,) it appears strange that a person attempting to discover it, and drawing...

...each transparent medium has its own particular refracting power, but for the same transparent medium the ratio of the sines of the angles of incidence and refraction is always the same. 980. Index of refraction. — The number which thus expresses the ratio of the...

...enabled us to trace the rays of light through a prism. For the path of R and R, must be such, that the ratio of the sines of the angles of incidence and refraction, will be the index of refraction for the given substance ; and the point F — where lines, making these...

...F"F'"= 2° SIX 37" « fill fill l—. ID 23'56" Ratio of E toiX 6:8.57 0:8.09 6:8.05 6:8.03 sibly in the ratio of the sines of the angles of incidence and refraction for water. This is only true for small angles of incidence, that is, for the lower fathoms; for, in...

...F" = 6° 41V 34" " F" F"' = 2° 3IX 37" " fill jn""==l°23'66" 6:8.67 6:8.09 6:8.05 6:8.03 sibly in the ratio of the sines of the angles of incidence and refraction for water. This is only true for small angles of incidence, that is, for the lower fathoms ; for, in...

...reflected. VIII. Virtual Hay. — The apparent direction of a reflected ray. IX. Refractive Index. — The ratio of the sines of the angles of incidence and refraction. X. Geometrical Focus. — The limiting position of the points in which the rays of a reflected or refracted...